Предмет: Математика, автор: ПолинаЯкименко

Задача. Знайдiть сторони прямокутника, периметр якого дорiвнюэ 28дм, а Дiагональ-10дм. Решать нужно с помощью системы ​

Ответы

Автор ответа: PolishCucumber
0

Ответ:

6дм и 8дм

Пошаговое объяснение:

D=диагональ=√(a^2+b^2)=10дм

P=периметр=(a+b)*2=28дм

==> a+b=14 ==> b=14-a

D=√(a^2+(14-a)^2)=10

избавляемся от корня, т.е. возводим в квадрат обе стороны

a^2+(14-a)^2=100

a^2+196-28a+a^2=100

2a^2-28a+196-100=0

2a^2-28a+96=0, делим на 2 для удобства ==>

a^2-14a+48=0

Дискриминант=196-4*48=196-192=4

a1=(14+2)/2=8

a2=(14-2)/2=6

При а=8: b=14-8=6

При а=6: b=14-6=8

Как видим один из них равен 6 дм, другой - 8дм

Ответ: 6дм и 8дм

Похожие вопросы
Предмет: Алгебра, автор: alinorbobaev97
Предмет: Английский язык, автор: romashka19956
Ex. 31. Use either Simple Present or Present Continuous of the
verbs in the brackets.
1. I can’t afford that ring. It (cost) … too much. 2. Look. It (begin)
… to rain. Unfortunately, I (have, not) … my umbrella with
me. Tom is lucky. He (wear) a raincoat. 3. I (own, not) … an umbrella.
I (wear) … a waterproof hat on rainy days. 4. Right now
I (look) … around the classroom. Ann (write) … in her book. Carlos
(bite) … his pencil. Peter (scratch ) … his head. Ahmed (stare) …
out of the window. He (seem) … to be daydreaming, but perhaps he
(think) … hard about verb tenses. What (think, you) … Ahmed (do)
... ? 5. There’s a book on my desk, but it (belong, not) to me. 6. Dennis
(fix) … the roof of his house today, and he (need) … some help.
Can you help him? 7. Barbara (tutor, often) … other students in her
math class. This afternoon she (help) … . Steve with his math assignment
because he (understand, not) … the material they (work)
… on in the class this week. 8. Right now I (look) … at Janet. She
(look) … angry. I wonder what’s the matter. She (have) … a frown
on her face. She certainly (have, not) … any fun right now. 9. A:
Who is that woman who (stand) … next to the window? B: “Which
woman ? (Talk, you) … about the woman who (wear) … the blue and
gold dress ? A: No , I (talk, not) … about her. I (mean) … the woman
who (wear) … the blue suit. B: Oh. I (know, not) … . I (recognize,
not) … her. 10. A: Close your eyes. Now listen carefully. What
(hear, you) … ? What (do, I) … ? B: I (believe) … you (rub) … the top
of your hand ? A: Close, but not exactly right. Try again. (Listen,
you) … carefully? B: Aha! You (rub) … your hands together. A:
Right!
Предмет: Английский язык, автор: romashka19956
Предмет: Математика, автор: алтунчик